The method I have used on mine is to start with the passenger rear, then the driver's rear, then passenger front, then driver front. This method has always worked for me. I have never used the Mityvac for this use though. I use the pump and hold it method.

When replacing the fluid, my father's mechanic said to use the gravity method...take the fill cap off of the resevoir, place buckets under each fitting, open all of the fittings and let it drain out taking care to keep the fluid in the resevoir a the appropriate level so you don't get air into the lines. Let all fluid drain until clear fluid comes out of all of the fittings, then tighten them up. This method has worked for my cars as well as my fathers and between the two of us, we own five of them.

Mike

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Mike

'80 300D
'84 300D
'85 300D
'87 300D